Vat dye.



' ITED STAIES PATENT ()FFltJE.

HEINRICH RAEDER.,.OF VOHWINKEL, NEAR ELBERFELD, GERMANY, A SSIGNOB' T0 FABBENFABRIKEN VORM. FRIEDR. BAYER? & 00.. OF ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

VAT DYE.

No Drawing.

To all whom it may concern:

lle it known that I, Hemmer: RAnonn, doctor of philosophy, chemist, citizen of the (.lernmn Empire, residing at Vohwinkel,

near Elberfcld, Germany, have invented new and useful Improvements in New Vat Dyes, of which the following is a s ecitication.

My invention relates to tie manufacture and production of new vat dyes of the anthracene series dyeing c'otton from the hydrosultite vat beautiful fast Bordeaux to violet shades. The process for their preparation consists in condensing two molecules of para aminoalkimyanthraquinones with one molecule of a dihalogen substituted anthraquiuonc.

The ncw products are after being dried and pulverized colored powders practically insoluble in water and iulthe usual organic solvents and soluble in concentrated sulfuric acid with from a blue. to green color. They yield on treatment with hydrosultite and caustic soda lye vats suitable for dyeing cotton fast Bordeaux to violet shades.

In carrying out the new processpractirally I can proceed as follows, the parts being by weight l lkauiple: A mixture of- 5H parts of 1.4- aminoanethox anthraquinone, :25 parts of 2.T-dichloroanthraquinone, 4 parts of enprous chlorid, 25 parts of anhydrous sodium acetate and300 parts of naphthalene is heated to boiling for about 6 hours. The resulting dye is precipitated from the'inelt with na htha. After cooli (o 40 to C. the ye is filtered oil, was ed with ligroin, glacial acetic acid, hydrochloric acid and water and dried. It is after being dried and pulverized a dark powder practically insoluble in water and in the usual organic solvents; it is soluble in concentrated sulfuric acid with Specification of Letters Patent. Patented Feb. 22, 1910.

Application flied October 21 1909. Serial No. 523,804.

a green-blue color. By treatment with reducing agents, e. g. hydrosulfite and NaOll a brown vat is obtained dyeing cotton beautiful violet shades. r

The product obtained from lat-aminomcthoxyanthraquinone+2.6-dicllloroanthraquinone dyes Bordeaux.

I clainu- 1 l. The herein described new vat dyestuffs of the anthracene series which can be ob,- tained fronra ml'a-aininoalkox none and a dihalogen substitute anthraquinone, which dvestutfs are, after being dried and pulverized, colored powders practically insoluble in water and in, the usual or anic anthraquisolvents, soluble in concentrated sufuric acid with from a blue to green color; ivmg rats with hydrosulfite and caustic sod a lye, which vats dye unmordanted cotton fast sul inric' acid with a green-blue color; giving a brown vat with hydrosulfite and caustic soda lye, which vat dyes cotton violet shades, substantially as described.

In testimony whereofl have hereunto set my hand in the presence of two subscribing witnesses.

HEINRICH RAEDER.

Witnesses: 7 .O'rmKtiNI CHAS. J. \Vamnr. 

